From: Correlation of qanadli obstruction index (QOI) and atrial size on CT pulmonary angiography (CTPA) in patients with pulmonary thromboembolism
LA/RA area (range)
Qanadli index & obstruction %
Number of patients in study
0.72–1.21
< 10 (< 25%)
22
0.62–0.79
10–20 (25–50%)
8
0.41–0.60
> 20 (> 50%)
15